Earnings Per Share Calculation (Tables)

6 Months Ended

Apr. 30, 2019

Earnings Per Share [Abstract]

Schedule of Reconciliation of Numerator and Denominator of Basic and Diluted Earnings Per Share

The following table (in thousands except per share amounts) is a reconciliation of the numerator and denominator of the basic net income (loss) per common share (“Basic EPS”) and the diluted net income (loss) per potential common share (“Diluted EPS”). Basic EPS is computed using the weighted average number of common shares outstanding. Diluted EPS is computed using the weighted average number of the following, in each case, to the extent the effect is not anti-dilutive:

(i) common shares outstanding; (ii) shares issuable upon vesting of stock unit awards; and (iii) shares issuable under Ciena’s employee stock purchase plan and upon exercise of outstanding stock options, using the treasury stock method.

	Quarter Ended April 30,				Six Months Ended April 30,
Numerator	2019		2018		2019		2018
Net income (loss)	$	52,738	$	13,856	$	86,354	$	(459,507	)

	Quarter Ended April 30,		Six Months Ended April 30,
Denominator	2019	2018	2019	2018
Basic weighted average shares outstanding	156,170	143,975	156,244	143,948
Add: Shares underlying outstanding stock options and stock unit awards and issuable under employee stock purchase plan	2,119	1,345	1,967	—
Add: Shares underlying 3.75% Convertible Senior Notes due 2018 (New)	—	2,653	—	—
Dilutive weighted average shares outstanding	158,289	147,973	158,211	143,948

	Quarter Ended April 30,				Six Months Ended April 30,
EPS	2019		2018		2019		2018
Basic EPS	$	0.34	$	0.10	$	0.55	$	(3.19	)
Diluted EPS	$	0.33	$	0.09	$	0.55	$	(3.19	)

Schedule of Weighted Average Shares Excluded From Calculation of Denominator for Basic and Diluted EPS

The following table summarizes the weighted average shares excluded from the calculation of the denominator for Diluted EPS due to their anti-dilutive effect for the periods indicated (in thousands):

	Quarter Ended April 30,		Six Months Ended April 30,
	2019	2018	2019	2018
Shares underlying stock options and stock unit awards	283	304	257	2,496
3.75% Convertible Senior Notes due October 15, 2018 (Original)	—	3,038	—	3,038
3.75% Convertible Senior Notes due October 15, 2018 (New)	—	—	—	1,672
4.0% Convertible Senior Notes due December 15, 2020	—	9,198	—	9,198
Total shares excluded due to anti-dilutive effect	283	12,540	257	16,404